leetcode-problemset/leetcode-cn/originData/network-delay-time.json

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            "questionId": "744",
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            "categoryTitle": "Algorithms",
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            "title": "Network Delay Time",
            "titleSlug": "network-delay-time",
            "content": "<p>You are given a network of <code>n</code> nodes, labeled from <code>1</code> to <code>n</code>. You are also given <code>times</code>, a list of travel times as directed edges <code>times[i] = (u<sub>i</sub>, v<sub>i</sub>, w<sub>i</sub>)</code>, where <code>u<sub>i</sub></code> is the source node, <code>v<sub>i</sub></code> is the target node, and <code>w<sub>i</sub></code> is the time it takes for a signal to travel from source to target.</p>\n\n<p>We will send a signal from a given node <code>k</code>. Return the time it takes for all the <code>n</code> nodes to receive the signal. If it is impossible for all the <code>n</code> nodes to receive the signal, return <code>-1</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/05/23/931_example_1.png\" style=\"width: 217px; height: 239px;\" />\n<pre>\n<strong>Input:</strong> times = [[2,1,1],[2,3,1],[3,4,1]], n = 4, k = 2\n<strong>Output:</strong> 2\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> times = [[1,2,1]], n = 2, k = 1\n<strong>Output:</strong> 1\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> times = [[1,2,1]], n = 2, k = 2\n<strong>Output:</strong> -1\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= k &lt;= n &lt;= 100</code></li>\n\t<li><code>1 &lt;= times.length &lt;= 6000</code></li>\n\t<li><code>times[i].length == 3</code></li>\n\t<li><code>1 &lt;= u<sub>i</sub>, v<sub>i</sub> &lt;= n</code></li>\n\t<li><code>u<sub>i</sub> != v<sub>i</sub></code></li>\n\t<li><code>0 &lt;= w<sub>i</sub> &lt;= 100</code></li>\n\t<li>All the pairs <code>(u<sub>i</sub>, v<sub>i</sub>)</code> are <strong>unique</strong>. (i.e., no multiple edges.)</li>\n</ul>\n",
            "translatedTitle": "网络延迟时间",
            "translatedContent": "<p>有 <code>n</code> 个网络节点，标记为&nbsp;<code>1</code>&nbsp;到 <code>n</code>。</p>\n\n<p>给你一个列表&nbsp;<code>times</code>，表示信号经过 <strong>有向</strong> 边的传递时间。&nbsp;<code>times[i] = (u<sub>i</sub>, v<sub>i</sub>, w<sub>i</sub>)</code>，其中&nbsp;<code>u<sub>i</sub></code>&nbsp;是源节点，<code>v<sub>i</sub></code>&nbsp;是目标节点， <code>w<sub>i</sub></code>&nbsp;是一个信号从源节点传递到目标节点的时间。</p>\n\n<p>现在，从某个节点&nbsp;<code>K</code>&nbsp;发出一个信号。需要多久才能使所有节点都收到信号？如果不能使所有节点收到信号，返回&nbsp;<code>-1</code> 。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/05/23/931_example_1.png\" style=\"height: 220px; width: 200px;\" /></p>\n\n<pre>\n<strong>输入：</strong>times = [[2,1,1],[2,3,1],[3,4,1]], n = 4, k = 2\n<strong>输出：</strong>2\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>times = [[1,2,1]], n = 2, k = 1\n<strong>输出：</strong>1\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>times = [[1,2,1]], n = 2, k = 2\n<strong>输出：</strong>-1\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= k &lt;= n &lt;= 100</code></li>\n\t<li><code>1 &lt;= times.length &lt;= 6000</code></li>\n\t<li><code>times[i].length == 3</code></li>\n\t<li><code>1 &lt;= u<sub>i</sub>, v<sub>i</sub> &lt;= n</code></li>\n\t<li><code>u<sub>i</sub> != v<sub>i</sub></code></li>\n\t<li><code>0 &lt;= w<sub>i</sub> &lt;= 100</code></li>\n\t<li>所有 <code>(u<sub>i</sub>, v<sub>i</sub>)</code> 对都 <strong>互不相同</strong>（即，不含重复边）</li>\n</ul>\n",
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